几种观赏性较好的石蒜属植物及繁殖栽培

从城市园林绿化对选择适应性强,抗逆性强,耐旱、耐湿和耐瘠薄土壤的地被花卉需求角度,围绕石蒜属植物的优良特性,对石蒜属植物的形态特征、生物学特性、繁殖栽培、园林应用等方面进行阐述介绍及推广应用。     

高速滚珠丝杠副动态特性分析

以赫兹接触理论和沟道控制理论为基础,同时考虑自身离心力以及陀螺力矩作用的影响,建立轴向载荷作用下的高速滚珠丝杠副动力学模型.采用数值分析方法计算不同运行工况对滚珠丝杠副力学特性的影响,得到了接触角、弹性变形等的变化规律.分析结果表明,转速和轴向载荷等工况对高速时滚珠丝杠副的动态特性影响较大,高速时滚珠丝杆副的动态特性较低速情况有着显著的变化.     

比色法测定肉丸中硼砂的不确定度评定

通过建立数学模型,分析肉丸中硼砂比色法测定的过程中影响测定结果的不确定度及其影响因素。同时对各分量标准不确定度也进行了分析和计算,得出了吸光度值、试验重复测量导致的标准不确定度是不确定度来源的最主要影响因素。最终通过合成和扩展得出了某肉丸中硼砂含量为(110±16)mg/kg。     

Leaf Smut of <Emphasis Type="Italic">Sagittaria latifolia </Emphasis>Caused by <Emphasis Type="Italic">Doassansia horiana</Emphasis>

A smut-like disease was found on the leaves of Sagittaria latifolia in Japan. Spore balls collected from the leaves of S. latifolia and S. trifolia var. edulis were used to cross-inoculate leaves of pathogen-free plants of the two species to identify the pathogen. Spots and swellings formed on leaves of the two species 10 days after inoculation. These symptoms were quite similar to those of the leaf smut disease of S. trifolia var. edulis caused by Doassansia horiana, and the spore balls were characteristic of the fungus. Therefore, the authors conclude that D. horiana caused leaf smut disease on S. latifolia. Received 18 January 2000/ Accepted in revised form 14 May 2000     

药用三七球磨法超微粉碎的试验研究

利用行星式球磨机对药用三七进行超微粉碎试验,就不同的球料比、转速、球磨时间对三七粉体粒径大小的影响进行了研究,并对粉碎前后粉末的粒度分布及微观形貌进行了表征.结果表明,球料比在m(研磨球)∶m(三七)=10∶1,转速500 r/min,时间90 min时得到的三七粉末粒度均匀,平均粒径11.992μm.电子显微镜观察到大片破裂细胞碎片,无大颗粒团块,表明单细胞充分破壁.     

彩色马蹄莲在西安的引种试验

对黎明女神、信念、金色魔力和财富4个品种彩色马蹄莲在西安的生长发育情况、园艺性状和烂球率等进行了观察研究。结果表明:财富适于作盆栽花卉,信念、黎明女神适于作切花栽培,而金色魔力适于作两用栽培。     

黄连木反季节移植研究

对自然生长的大小不一的58株黄连木进行反季节移植,成活率达87.93%.结果表明,黄连木在其生长发育旺盛季节可进行反季节移植;采取保持土球完好、修枝疏叶、避免树皮损伤、减少中途停滞时间、生根粉处理、消毒和精心养护等技术措施,能够保证较高的成活率.     

An organic activated bentonite mechanism for improving pelletization

Adding organic activated bentonite to palletizing production improves the thermal stability of green balls and the iron grade of fired pellets. This addition also permits a reduction in the bentonite dosage. We study the action mechanism of the organic     

The Research and Simulation of the Fuzzy-PID Control System for Ball Mill Pulverizing of Power Plant

This paper focuses on the main problems in the operation control for ball mill pulverizing system, proposes the dynamic mathematical model for the steel ball mill pulverizing system , simulates and analyzes the dynamic character of the system. A Fuzzy-PID controller with on-line self-tuning parameters based on fuzzy control technology is proposed .The simulation results show that the Fuzzy-PID control system can improve the controlling effect and the ability of suppressing disturbances.     

球磨对胡桑木粉可及度影响的研究

为了提高木粉改性反应时试剂对木粉的可及度,采用行星式球磨机对胡桑木粉进行球磨预处理,研究了干磨、加水湿磨以及球磨时间对木粉的粒度、结晶度和可及度的影响。研究结果表明:胡桑枝条木粉干磨4 h粒度达到最低值,中位径(D50)为8.982μm,纤维素结晶度明显降低;4 h后由于发生团聚现象,粒度反而随球磨时间延长而增大,结晶度不再变化;干磨木粉的粒度越小,木粉的可及度越高。湿磨时,由于水的分散阻聚作用,粒度随球磨时间的延长逐渐减小,球磨12 h原料D50达到4.357μm;木粉湿磨后不同干燥方式对木粉的结晶度和可及度影响很大:湿磨木粉经烘箱干燥后的结晶度显着高于冷冻干燥的;烘箱干燥的湿磨木粉可及度比未球磨木粉小,且随湿磨木粉粒度的减小而降低;冷冻干燥的湿磨木粉可及度与未球磨木粉相比明显提高,而且高于干磨时间相同的木粉。